How to track events from a parent widget

Question

My goal is that when I hover my mouse over the thumbnail image, a popup image of the original image will display to the right of the mouse; and if my mouse leaves the thumbnail, the popup destroys itself.

The issue I have is that the leaveEvent from the thumbnail does not trigger, because the popup takes control of the application main loop (or that is what I think is happening - I am not actually sure).

Here is my code:

class UI_ImagePopup(QLabel):
    def __init__(self):
        QLabel.__init__(self)
        movie = QMovie("C:/Users/Zelly/Desktop/thumbnail/1vgb1al.jpg", QByteArray(), self)
        movie_screen = QLabel()
        # Make label fit the gif
        movie_screen.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
        movie_screen.setAlignment(Qt.AlignCenter)
        # Create the layout
        main_layout = QVBoxLayout()
        main_layout.addWidget(movie_screen)
        self.setLayout(main_layout)
        # center the zoomed image on the thumb
        position = self.cursor().pos()
        position.setX(position.x() +50)
        position.setY(position.y())
        self.move(position)
        # The following is blackmagic copy pasted from the internet
        # FramelessWindowHint may not work on some window managers on Linux
        # so I force also the flag X11BypassWindowManagerHint
        self.setWindowFlags(Qt.Popup | Qt.WindowStaysOnTopHint 
                            | Qt.FramelessWindowHint 
                            | Qt.X11BypassWindowManagerHint)
        movie.setCacheMode(QMovie.CacheAll)
        movie.setSpeed(100)
        movie_screen.setMovie(movie)
        movie.start()

    def mousePressEvent(self, event):
        self.close()

class Ui_ImageLabel(QLabel):
    def __init__(self):
        QLabel.__init__(self)
        self.setPixmap(QPixmap("C:/Users/Zelly/Desktop/thumbnail/1vgb1al.jpg"))
        self.p = None

    def enterEvent(self, event):
        print("Enter event")
        self.p = UI_ImagePopup()
        self.p.show()
        event.accept()

    def leaveEvent(self, event): # not triggered
        print("Leave event")
        self.p.destroy()

class Ui_MainWindow(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        self.setMinimumSize(1024, 512) #TODO: Resizable
        self.setMaximumSize(1024, 800)
        self.gridlayout = QGridLayout(self)
        self.setLayout(self.gridlayout)
        for i in range(6):
            pic = Ui_ImageLabel()
            self.gridlayout.addWidget(pic,0,i)
        self.show()

if __name__ == '__main__':
    app = QApplication(sys_argv)
    ex = Ui_MainWindow()
    sys_exit(app.exec_())